Update virtual-env.md

software/virtual-env.md

@@ -818,7 +818,7 @@ In C++, there's no virtual environment to delete. However, you can remove your l
 
 Remember to also remove or comment out the environment variable settings in your `~/.bashrc` or `~/.bash_profile` if you no longer need them.
 
-# Rust
+## Rust
 
 ### How to simulate a virtual environment with rust
 
@@ -880,4 +880,4 @@ Note: If you want to keep the source code but remove all compiled artifacts and
 ```bash
 cargo clean
 ```
-This will remove the target directory, which contains all compiled files and downloaded dependencies.
\ No newline at end of file
+This will remove the target directory, which contains all compiled files and downloaded dependencies.